Safety-link for draw-bench chains.



W. W. KENN,BDY. SAFETY LINKS FOR DRAW BENCH CHAINS. APPLIOATIONE'ILED MAR. 19, 1912.

Patented Aug. 27, 1912.

INVENTOR man snares PATENT ons cn.

winners W. nannnnv, or WHEEMNG, Wnsr vxnsmm, Assmnon 'ro NATIONAL TUBE comrsnv, or rxrrsnuaen, .rnnnsvnvama, A CORPORATION or new JERSEY.

SAFETY-LINK nos nnAw-snncn CHAINS.

1,0363%}. eamen or Lettcrslatent. t t g; h 19,1913 seam Naflfidflao. a

' Application iled Here To whmn it may concern: p

it known that I WILLIAL: KEN- NEDY, a citizen of the llnited States, resid ing at Wheeling, in the county of Ohio and 5 State of West Virginia,- have invented certain new and useful Improvements in Safety-Links for Draw Bench Chains," of which the following is a specification.

My invention. relates to apparatus used in aking welded pipes and tubes and more particularly relates to the construction of the endless chains employed on the draw benches used in drawing pipes and tubes and to the construction of the hook links ih the chains having means b which the tong reins are attached to the c ains in the pipe or tube drawin operations. Heretofore, e ton s, in addition to being attached to the draw chain by hand have been detached manually from the" chain, andunless the tongs are detached at the -{proper ti=-1e or when the end of the ten reaches a certain position on the draw 1 ben in the pipe draw ng operations, great liability of damage or breakage to the pipe drawing mechanism incurred.

One ob'ect of this invention is to provide a safety ink for draw bench chains havmg im rowed means b which the tongs are detac ably. secured o the chain in the pipe drawing 0 rations andhaving novel meansv whereby th e. ton are automatically released and detac ed irom 'the draw chain when the tongs and a. pipe held "thereby reach 'theend 'of a redetermined iton uponthe draw bench in, the ,pipe rawmg r a 1 Referring :to the accdmpanynig drawings forming parent this spec1fication,-Figure 1 is; a. sectional side elevation showing one end of adraw bench'with a draw chain thereon having Safety iorming part thereof as-constructed *snd arranged in accordance withflmy invention. 1 Fig. 2 is a detail side elevation, on an enlarged scale, of one form of safety link as constructed in accordance with. this invention. Fig. 3 is a. transverse section olfithejsm the stwtion being taken on the line, III- IH of Fig. 2.

In the drawings, 2 desi ates the'rea-r and ate draw bnch having stings. 3 thereon .-.;whieh;-i niounted;the shaft a for the f wheel 5 by which chain sprmm wheel: it is which engage with the draw-chain in actuating the draw chain. v

The draw chain-isconstructed of a series Jof single links 7 which are connected at their ends to a seriesof shorter double links 8 by 0 means of pinso'r rivets :9. At suitable intertervals in. the lengthof the so-forined chain the safety links 10 are inserted, these safety links having a. forked book 11 by hich the chain is attached to the end of a in 12 of" the pipe drawing tongs. The rem 12 has a button or head 12* on 'its outer end and the hook is provided with a slot 13 to form the teng engaging books 11, as is best shown in Fig. 3. A. wearing surface 14 provided on the forked hook 11, is removably held in placeby means of rivets 15.

The safety links 10 have a transverse opening between the holes in the ends there- 0 far the rivets 16' in which a movable tong-disengaging arm 17 is pivoted by one end to one of the pins 16. The opposite end of the arm or lever 17 is adapted to en gage with the button on the end of the rein 1201: the tongs when the tongs reach a predetermined position on'the draw bench rela- I tive to the driving sprocket wheel 5 and the rein of the tongs is engaged. by a tooth 6 of the sprocket wheel 5, so as to swing. and engage with the tongs rein 12 and by lifting the end of the rein 12,.clearthe hook on the safety link 10 and disengage the tongs from the chain.

The draw chain formed by the links 7,8 and 10 is endless and passes around the driving sprocket'wheel 5,,and an adjustable ,idler sprocket wheel on the opposite end of the draw bench (not shown).

A shoulder or jog. 18 on thearms 17 is provided to limit the movement of these arms and hold the arms in the desired position when the chain is traveling from the driving sprocket wheel toward the idler wheel at the opposite end of the endless chain.

"In the operation of my improved-apparatus the endless draw chain is actuated throiigh the medium \of the driving sprocket wheel 5 in the usual manner:

When the tongs are attached to the end of a pipe skelp to be drawn and welded into a pipe, the operator placesmheaend 12 of one QfQtbe reins"'within the. recess or slot 13 series sf tags or ten baelosest one of the forked geeks 11 on "one-at fllesafety links 10. The raw chain,

atel stopsgin its disengagedposition until which is constantly moving-"in the direction;

of the arrow shown in Fig. 1', thenveng ages w th the. button- 1 2i,. on the end ofthe reinlengthwise overthe draw bench.

When gthesafety link 10 to which the menu -time:the to'figsand the ipe sk lp' ami si are 'f -attacliedzireaches the position is a it moved by a tooth-11 6f the sprocket wheel 5 s: into the ='positio shown at the right of'Fi'g. l theTswinging a'rm 17 on the safety link 10'Will been-- gaged by one of the'teethfiin. the driving sprocket and will be caused to lift from its engaged position shown at the left of Fig. 1 li 'n at the right of this winging arms 17 is itSI OIltQI. swinging'g'end engages with the ':-reini1 1 .of=thetongs and lifts the end of the =-'iein outofl the slot"13, holding the rein,

the forward movement of which immedi the ink 10 has passed beyond the end of the tong rein. The tong-rein is then grasped liby a'second'operator and is manually dis- -engaged from theethen formed pipe; attached thereto. The-tongs time then removed from :e dijaiibench' and zare passed back to the cppos1te'"end of the-i bench in readiness to The again .used--1bythetoperator known as the welder 'in drawing-another pipe, while the pipe or tube whichwas attached thereto is delivered transversely of its length to a cooling bed or; other ;;ap ')'arenttothose skilled in the art.

'Bythe use of my imp'roved safety link place of storage in the usual manner. 1

The advan'tagesof :my invention will be the draw chains; are; automatically disconnected or disengaged from the rein of the -'.-adr'aw bench and liability ,of breakage or" tongswhen the, reinsire'ach the end of the a=.otherrdarnagezto*the apparatus is avoided and overcome.

' Modifications in the construction and arrangement of the parts may be made without departing from my invention. Instead ntilizingwthe ,diiving sprocket chain to ar'actuatethesswinginggvarms 17 of the hook rlhiks 10. in-disengagmg thejtongs from the =1clia'i11, ;an, idlersprocket wheel may be located at thev desired position in the length -of a the, bench, the-1 teeth" of which move the 1' :i'u-msgto ,:lif-t,,t-he tongs and free the chain,

andfothei: changes may be made;

ij l. Ih a in h scope of the appendedclaims ":spi'ocket cliam,;'.-aft least one linkfof said i ichainhavinga-forkedtongs-en aging hook :thereon,- ;a sprocket wheel for. riving said ichain, ;means onthe forked link-whereby; the tongsare automatically disengaged from i con of this men may be obtained to: a" ma ma,

I Washington, I. 0."-

"tongs.v v 22; In a pipetdrawing bench,

sprocket chain hook links at intervals in h length. eisissbfinshav s reeigaging, 'forksthereon, asprocket Wheel for, driving said chain, mean's onwthe 'forked' -bench, said means beingwactuated byengage- -.ment iwith th th (1 sprocket wager V In testimony whereeL I havelhereunto set riiiwins bench anrendlessi my -1 3- Witnesses;

the hook link and mechanism to'engage and actuate s'aid'mea'n sat a predetermined position on said draw bench to disengage the links whereby the tongs are automatically disengaged from the hook linksand mechanismto engage and actuate said means-at a predetermined'position on said draw bench to disengage the tongs.

. 3.- Inv a pipe drawing bench, an endless sprocket chain, at least one link of said;

chain having a forked tongs-engaging hook thereon, a sprocketwheel for'driving saidchain, a swinging arm pivoted to-said forked hook link arranged. to swing and ,contact an endlesswith the tongs to disengage the tongsfrom the chain, and means for actuating said arm at a predetermined position on said draw bench to disengage the tongs. j

4. In a pi e drawing bench, an endless sprocket chain, hook links at intervals in the length of said chain having tongs engaging forks thereon, a sprocket wheel for driving said chain, swinging arms pivoted to said forked hooklinks arranged to swing and contact with the tongs to disengage the tongs from the chain,- andmeans for actuating said armsto disengage the tongs at a predetermined position on said draw bench to disengage the tongs.

5'. In a pipe drawing bench, an endless sprocket chain, at least one vlink of said chain having a forked tongs-engaging hook thereon, a sprocket Wheel for driving said the length of said chain having tongs-em gaging forks thereon, a sprocket wheel for. drivingsaid chain, and mechanical means on thexforked links whereb ,the tongs are aubench, an endless tomaticallydisengaged. rom the hooklinks i at a predetermined posit-ion on said draw the "chain,

WIL IAM W. membe -i T. E. Bobmr, E. ZINN.

the Commissioner 6: intents, 

